Height adjustable desk



FIG. 1 is a top perspective view of a height adjustable desk showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line portion of the figure drawings is included to show portions of the article that forms no part of the claimed design. 

CLAIM The ornamental design for a height adjustable desk, as shown and described. 